Sequoia is a genus in the cypress family Cupressaceae (formerly treated in Taxodiaceae), containing the single living species Sequoia sempervirens. Common names include Coast Redwood and California Redwood (it is one of three species of trees known as redwoods). It is an evergreen, long-lived, monoecious tree living for up to 2,200 years, and is the tallest tree in the world, reaching up to 115.5 m (379.1 ft) in height and 8 m (26 ft) diameter at breast height.

Sequoiadendron giganteum (Giant Sequoia, Sierra Redwood, or Wellingtonia) is the sole species in the genus Sequoiadendron, and one of three species of coniferous trees known as redwoods, classified in the family Cupressaceae in the subfamily Sequoioideae, together with Sequoia sempervirens (Coast Redwood) and Metasequoia glyptostroboides (Dawn Redwood).

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The name Sequoia is also used as a general term for the subfamily Sequoioideae in which this genus is classified together with Sequoiadendron (Giant Sequoia) and Metasequoia (Dawn Redwood).